package test.apps.admin.action;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import system.pojo.HHUserPojo;

import com.xyrj.mvc.HHAction;

/**
 * 获取验证码
 * 
 * @ClassName: HHRandomPictureAction
 * @Description:
 * @author maoyun0903(maoyun19900818@163.com);
 * @date 2012-10-8 下午2:40:48
 * @version V1.0
 */
public class HHRandomAction extends HHAction {

	private ByteArrayInputStream inputStream;

	/**
	 * 构造函数
	 * 
	 * 初始化类成员
	 * 
	 * @param HttpServletRequest
	 *            request 当前用户的请求对象
	 * @param HttpServletResponse
	 *            response 当前Http反馈对象
	 */
	public HHRandomAction(HttpServletRequest request,
			HttpServletResponse response) {
		super(request, response);
	}

	/**
	 * 主方法
	 * 
	 * @Title: index
	 * @Description:
	 * @param @throws Exception
	 * @return void
	 * @throws
	 */
	public void index() throws Exception {
		// 在内存中创建图象
		int width = 55, height = 20;

		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);

		// 获取图形上下文
		Graphics g = image.getGraphics();

		// 生成随机类
		Random random = new Random();

		// 设定背景色
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);

		// 设定字体
		g.setFont(new Font("Times New Roman", Font.PLAIN, 18));

		// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}

		// 取随机产生的认证码(6位数字)
		String sRand = "";
		for (int i = 0; i < 4; i++) {
			String rand = String.valueOf(random.nextInt(10));
			sRand += rand;
			// 将认证码显示到图象中
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			// 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
			g.drawString(rand, 13 * i + 6, 16);
		}
		// 将验证码传入Session中
		this._view.setSessionAttr("valicode", sRand);
		// 图象生效
		g.dispose();
		ByteArrayOutputStream output = new ByteArrayOutputStream();
		ImageOutputStream imageOut = ImageIO.createImageOutputStream(output);
		ImageIO.write(image, "JPEG", imageOut);
		output.flush();
		imageOut.close();
	}

	/**
	 * 给定范围获得随机颜色
	 * 
	 * @Title: getRandColor
	 * @Description:
	 * @param @param fc
	 * @param @param bc
	 * @param @return
	 * @return Color
	 * @throws
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}
